Spur-gear-testing fixture



Feb.. 2U', 1923.

' 1,445,631., W. P. LOTZ. Y sPuR GEAR TESTING FIXTURE. FILED FEB. 3,1921.

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' i mlm/Tol? wfg@ La .mame/T5 l rections or" errors may be made readily Without removing either of the gears from the fixture by grinding` or tiling as will be understood.l The horizontality of the axes of the gears makes these operations convenient since the teeth are exposed to view and in proper position for Working. After a pinion has been tested the bell crank may be locked in retracted position by means of the latch /u While one pinion g is removed and another one inserted in the vertical arm f2.

Matters which are of mechanical design and detail may be varied to meet different requirements oil use yWithout departing from the scope, of the invention, the essence of which resides in the horizontality ot' the axes of the and the swinging of one gear with relation to another on a bell crank lever.

l claim as my invention:

l. gear testing fixture including a rotatable head to support a master gear rotatably With its axis horizontal, means to support the head, a bell crank lever on one arin of which is supported a gear to mesh with the first named gear, means to support the bell Crank levenand an indicator havingv a plunger and mounted on the supporting means for the head with said plunger in operative relation to said bell crank lever to indicate irregularities when `the gears are rotated.

2. A gear testing fixture including ajournal bearing, a gear holder in which is mounted rotatably a master gear on a horizontal axis, a bell crank lever in one arm of which is 'journaled a gear to mesh with the irst named gear, means to support the bell crank lever, (1o-operating gage points carried on the journal head and on one arm of the bell crank respectively, and an indicator having a plunger and mounted on the supporting means for the journal head with said plunger in operative relation to the bell crank to indicate errors when the gears are rotated.

3. A gear testing fixture including;` a journal head, a gear holder in which is mounted a master gear to rotate on a horizontal axis, a bell crank having a vertical arin to support a gear tor mesh with the lirst named, gear, means to support the bell crank, a, spring cooperating ivitli the other arin oit said bell crank to hold the gears in mesh, tro-operating gage points on the journal. head and on the vertical erin of the bell crank, and an inrli eator having a plunger and mounted with the journal head with said plunger operatively engaged with the vertical arin ol. the bell crank to indicate errors when the gears are rotated. l

el. A gear testingr fixture including a gear holder mounted with a journal head to revolve on a horizontal axis, clamps carried thereon to engage. a gear blank releasablv, a bell crank lever having` a vertical arm to support a second gear, means to support the bell crank lever. a spring ceo-operating with the other arin ol the bell crank to hold the gears in mesh, means to limit the inoveniei'nt of the bell crank under the influence ol? said spring` land means to lock the bell crank against movement.

This specification signed this 31st day of Jan., A. D. 199,1.

VALTER P. LOTZ. 

